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Korean Subject Particles (이/가)

We all know that 이 and 가 are attached to nouns
to indicate that it is the subject of a sentence. They are easy to distinguish
because the subject is always placed at the beginning of the sentence such as
the following.

우리엄마가시장에있어요.

My mom is at the market.

겨울이왔습니다.

Winter is here.

우리학교에잘생긴남자들이많아요.

There are a lot of handsome boys at school.

But that's not limited to that.
Did you know that there are a few other standard rules we can use 이 and 가 for? Here they are as
follows.

First, when the predicate is 아니다 (to be not)
and 되다 (to
become), 이 and 가 are attached to the
word before them. In this sense, 이 and 가 are not used to indicate the subject of the
sentence, but the complement. This is interesting because it contradicts the
basic knowledge that we had. Then, what happens to the subject? They take the
markers 은 or 는 instead.

​이것은커피가아니에요.

This is not coffee.

카일씨는선생님이되었어요.

Kyle became a teacher.

Second, when pronouns such
as 나, 저, and 너 meets the
particle 가 (since
they all end in a vowel), the syllables change and become 내가, 제가, and 네가.

내가할게.

I will do it.

네가좋아!

I like you.

Lastly, when the last syllable
of a person’s name ends with a consonant, we attach 이 to it and add 가 to mark the subject.
When a person's name ends with a vowel, we simply add 가.